diff --git a/config.h.in b/config.h.in
index b5c73417d..d6dc2f622 100644
--- a/config.h.in
+++ b/config.h.in
@@ -568,6 +568,9 @@
 /* Define to 1 if you have the `rl_free_line_state' function. */
 #undef HAVE_RL_FREE_LINE_STATE
 
+/* Define to 1 if the system has the type `rl_hook_func_t'. */
+#undef HAVE_RL_HOOK_FUNC_T
+
 /* Define to 1 if you have the `rl_insert_close' function. */
 #undef HAVE_RL_INSERT_CLOSE